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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,123 @@ | ||
| package io.github.ljwlgl.util; | ||
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| import java.awt.*; | ||
| import java.awt.image.BufferedImage; | ||
| import java.util.concurrent.ThreadLocalRandom; | ||
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| /** | ||
| * @author zq_gan | ||
| * @since 2018/5/23 | ||
| **/ | ||
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| public class CaptchaUtil { | ||
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| static char[] chars = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', | ||
| 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', | ||
| 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}; | ||
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| /** | ||
| * 生成一个位数为count的随机验证码 | ||
| * | ||
| * @param count | ||
| * @return | ||
| */ | ||
| public static String genCaptcha(int count) { | ||
| StringBuilder captcha = new StringBuilder(); | ||
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| for (int i = 0; i < count; i++) { | ||
| char c = chars[ThreadLocalRandom.current().nextInt(chars.length)];//随机选取一个字母或数字 | ||
| captcha.append(c); | ||
| } | ||
| return captcha.toString(); | ||
| } | ||
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| /** | ||
| * 为一个验证码生成一个图片 | ||
| * <p> | ||
| * 特性： | ||
| * - 颜色随机 | ||
| * - 上下位置随机 | ||
| * - 左右位置随机，但字符之间不会重叠 | ||
| * - 左右随机旋转一个角度 | ||
| * - 避免字符出界 | ||
| * - 随机颜色的小字符做背景干扰 | ||
| * - 根据字符大小自动调整图片大小、自动计算干扰字符的个数 | ||
| * | ||
| * @param captcha | ||
| * @return | ||
| * @author XuJijun | ||
| */ | ||
| public static BufferedImage genCaptchaImg(String captcha) { | ||
| ThreadLocalRandom r = ThreadLocalRandom.current(); | ||
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| int count = captcha.length(); | ||
| int fontSize = 80; //code的字体大小 | ||
| int fontMargin = fontSize / 4; //字符间隔 | ||
| int width = (fontSize + fontMargin) * count + fontMargin; //图片长度 | ||
| int height = (int) (fontSize * 1.2); //图片高度，根据字体大小自动调整；调整这个系数可以调整字体占图片的比例 | ||
| int avgWidth = width / count; //字符平均占位宽度 | ||
| int maxDegree = 26; //最大旋转度数 | ||
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| //背景颜色 | ||
| Color bkColor = Color.WHITE; | ||
| //验证码的颜色 | ||
| Color[] catchaColor = {Color.MAGENTA, Color.BLACK, Color.BLUE, Color.CYAN, Color.GREEN, Color.ORANGE, Color.PINK}; | ||
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| BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); | ||
| Graphics2D g = image.createGraphics(); | ||
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| //填充底色为灰白 | ||
| g.setColor(bkColor); | ||
| g.fillRect(0, 0, width, height); | ||
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| //画边框 | ||
| g.setColor(Color.WHITE); | ||
| g.drawRect(0, 0, width - 1, height - 1); | ||
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| //画干扰字母、数字 | ||
| int dSize = fontSize / 3; //调整分母大小以调整干扰字符大小 | ||
| Font font = new Font("Fixedsys", Font.PLAIN, dSize); | ||
| g.setFont(font); | ||
| int dNumber = width * height / dSize / dSize;//根据面积计算干扰字母的个数 | ||
| for (int i = 0; i < dNumber; i++) { | ||
| char d_code = chars[r.nextInt(chars.length)]; | ||
| g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255))); | ||
| g.drawString(String.valueOf(d_code), r.nextInt(width), r.nextInt(height)); | ||
| } | ||
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| //开始画验证码： | ||
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| // 创建字体 | ||
| font = new Font(Font.MONOSPACED, Font.ITALIC | Font.BOLD, fontSize); | ||
| // 设置字体 | ||
| g.setFont(font); | ||
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| for (int i = 0; i < count; i++) { | ||
| char c = captcha.charAt(i); | ||
| g.setColor(catchaColor[r.nextInt(catchaColor.length)]);//随机选取一种颜色 | ||
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| //随机旋转一个角度[-maxDegre, maxDegree] | ||
| int degree = r.nextInt(-maxDegree, maxDegree + 1); | ||
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| //偏移系数，和旋转角度成反比，以避免字符在图片中越出边框 | ||
| double offsetFactor = 1 - (Math.abs(degree) / (maxDegree + 1.0));//加上1，避免出现结果为0 | ||
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| g.rotate(degree * Math.PI / 180); //旋转一个角度 | ||
| int x = (int) (fontMargin + r.nextInt(avgWidth - fontSize) * offsetFactor); //横向偏移的距离 | ||
| int y = (int) (fontSize + r.nextInt(height - fontSize) * offsetFactor); //上下偏移的距离 | ||
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| g.drawString(String.valueOf(c), x, y); //x,y是字符的左下角，偏离原点的距离！！！ | ||
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| g.rotate(-degree * Math.PI / 180); //画完一个字符之后，旋转回原来的角度 | ||
| g.translate(avgWidth, 0);//移动到下一个画画的原点 | ||
| //System.out.println(c+": x="+x+" y="+y+" degree="+degree+" offset="+offsetFactor); | ||
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| //X、Y坐标在合适的范围内随机，不旋转： | ||
| //g.drawString(String.valueOf(c), width/count*i+r.nextInt(width/count-fontSize), fontSize+r.nextInt(height-fontSize)); | ||
| } | ||
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| g.dispose(); | ||
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| return image; | ||
| } | ||
| } |
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src/main/java/io/github/ljwlgl/util/EncodeDecodeUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| package io.github.ljwlgl.util; | ||
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| import org.apache.commons.lang3.StringUtils; | ||
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| import java.security.MessageDigest; | ||
| import java.util.Base64; | ||
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| /** | ||
| * @author zqgan | ||
| * @since 2019/4/28 | ||
| **/ | ||
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| public class EncodeDecodeUtil { | ||
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| private static final char[] HEX = {'0', '1', '2', '3', '4', '5', | ||
| '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; | ||
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| private static final String DEFAULT_CHARSET = "utf-8"; | ||
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| /** | ||
| * 对字符串进行MD5加密 | ||
| * @param str 待加密字符串 | ||
| * @return 加密后的字符串 | ||
| */ | ||
| public static String encodeWithMD5(String str) { | ||
| return encode("MD5", str); | ||
| } | ||
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| /** | ||
| * 对字符串进行SHA1加密 | ||
| * @param str 待加密字符串 | ||
| * @return 加密后的字符串 | ||
| */ | ||
| public static String encodeWithSHA1(String str) { | ||
| return encode("SHA1", str); | ||
| } | ||
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| /** | ||
| * 对字符串进行SHA-256加密 | ||
| * @param str 待加密字符串 | ||
| * @return 加密后的字符串 | ||
| */ | ||
| public static String encodeWithSHA256(String str) { | ||
| return encode("SHA-256", str); | ||
| } | ||
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| /** | ||
| * 通过加密算法加密字符串 | ||
| */ | ||
| public static String encode(String algorithm, String str) { | ||
| if (str == null) { | ||
| return null; | ||
| } | ||
| try { | ||
| MessageDigest messageDigest = MessageDigest.getInstance(algorithm); | ||
| messageDigest.update(str.getBytes()); | ||
| return getFormattedText(messageDigest.digest()); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
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| } | ||
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| public static String encodeBase64(String str) { | ||
| if (StringUtils.isBlank(str)) { | ||
| return null; | ||
| } | ||
| try { | ||
| return Base64.getEncoder().encodeToString(str.getBytes(DEFAULT_CHARSET)); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| public static String decodeBase64(String str) { | ||
| if (StringUtils.isBlank(str)) { | ||
| return null; | ||
| } | ||
| try { | ||
| byte[] bytes = Base64.getDecoder().decode(str); | ||
| return new String(bytes, DEFAULT_CHARSET); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| public static String decodeUrl(String str) { | ||
| if (StringUtils.isBlank(str)) { | ||
| return null; | ||
| } | ||
| try { | ||
| return java.net.URLDecoder.decode(str, "UTF-8"); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| public static String encodeUrl(String str) { | ||
| if (StringUtils.isBlank(str)) { | ||
| return null; | ||
| } | ||
| try { | ||
| return java.net.URLEncoder.encode(str, "UTF-8"); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| private static String getFormattedText(byte[] bytes) { | ||
| int len = bytes.length; | ||
| StringBuilder buf = new StringBuilder(len * 2); | ||
| // 把密文转换成十六进制的字符串形式 | ||
| for (int j = 0; j < len; j++) { | ||
| buf.append(HEX[(bytes[j] >> 4) & 0x0f]); | ||
| buf.append(HEX[bytes[j] & 0x0f]); | ||
| } | ||
| return buf.toString(); | ||
| } | ||
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| } |
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